the power steering on our c90 has started working slower. we checked the pressure at the cylinder and found it to be 2150. then we held steering wheel with line off the cylinder to check for cylinder leakage this to was good. we then pulled the priority flow divider in the mcv and inspected it. Then we gave the valve in the hand pump an extra turn down to see if we could see an improvement, none so far. Pump and main relief are new. we did just have it split very recently for new directional clutches and pto work. Is there any control on the return oil from the steering. any ideas would sure help thanks